Numerical Simulation of Violent Wave Impact by ISPH Method

AbstractSmoothed particle hydrodynamics (SPH) is an attractive method for simulating unsteady flows with free-surfaces due to its Lagrangian form. Free-surface tracking or capturing is not required and hence arbitrarily complex free-surface deformations can be handled automatically. Traditionally, the simulation of incompressible fluid flow by the SPH method has been through a weakly compressible SPH formulation (WCSPH) which has low accuracy in predicting force and pressure. To overcome the limitations of the WCSPH formulation, a truly incompressible approach has been developed and proved to be more accurate and stable for many problems. In this paper a fully incompressible SPH method is applied to simulate violent interactions between free-surface and body. The calculation of forces on rigid body is improved for higher accuracy. Improved position correction technique is applied in moving boundary condition. Stability and accuracy of the present ISPH scheme are tested by dam breaking and water entry, and the results agree well with both experimental data and other numerical results